In a couple of years, the new powerful machine can disrupt national security.
Everything from credit-card transactions to text messaging is encrypted using an algorithm that relies on factorization or reverses multiplication. An enormous number—several hundred digits long—acts as a lock on encrypted data, while the number’s two prime factors are the key. This so-called public-key cryptography is used to protect health records, online transactions and vast amounts of other sensitive data because it would take classical computer years to find those two prime factors. Quantum computers could, in theory, do this almost instantly.
https://www.wsj.com/articles/how-googles-quantum-computer-could-change-the-world-1508158847
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